Low Cost Instrumentation AmplifierData SheetAD622FEATURESPIN CONFIGURATIONEasy to useRG 18RGAD622Low cost solution–IN27+VSHigher performance than two or three op amp design+IN36OUTPUTUnity gain with no external resistor 001 Optional gains with one external resistor–VS 45REF 00777- (Gain range: 2 to 1000) Figure 1. 8-Lead PDIP and 8-Lead SOIC_N (N and R Suffixes) Wide power supply range: ±2.6 V to ±15 V Available in 8-lead PDIP and 8-lead SOIC_N packagesGENERAL DESCRIPTIONLow power, 1.5 mA maximum supply current The AD622 is a low cost, moderately accurate instrumentation DC performance amplifier in the traditional pin configuration that requires only 0.15% gain accuracy: G = 1 one external resistor to set any gain between 2 and 1000. For a 125 µV maximum input offset voltage gain of 1, no external resistor is required. The AD622 is a 1.0 µV/°C maximum input offset drift complete difference or subtractor amplifier system that also 5 nA maximum input bias current provides superior linearity and common-mode rejection by 66 dB minimum common-mode rejection ratio: G = 1 incorporating precision laser-trimmed resistors. Noise12 nV/√Hz @ 1 kHz input voltage noise The AD622 replaces low cost, discrete, two or three op amp 0.60 µV p-p noise: 0.1 Hz to 10 Hz, G = 10 instrumentation amplifier designs and offers good common- AC characteristics mode rejection, superior linearity, temperature stability, 800 kHz bandwidth: G = 10 reliability, power, and board area consumption. The low cost of 10 µs settling time to 0.1% @ G = 1 to 100 the AD622 eliminates the need to design discrete 1.2 V/µs slew rate instrumentation amplifiers to meet stringent cost targets. While APPLICATIONS providing a lower cost solution, it also provides performance and space improvements. Transducer interface Low cost thermocouple amplifierTable 1. Next Generation Upgrades for AD622Industrial process controlsPartCommentDifference amplifier AD8221 Better specs at lower price Low cost data acquisition AD8222 Dual channel or differential out